1995 annual epidemiologic surveillance report for Sandia National Laboratory-Albuquerque

A centrifugal compressor working with supercritical CO 2 (S-CO 2 ) has several advantages over other supercritical and conventional compressors. S-CO 2 is as dense as the liquid CO 2 and becomes difficult to compress. Thus, during the operation, the S-CO 2 centrifugal compressor requires lesser compression work than the gaseous CO 2 . The performance of S-CO 2 compressors is highly varying with tip clearance and vanes in the diffuser. To improve the performance of the S-CO 2 centrifugal compressor, knowledge about the influence of individual components on the performance characteristics is necessary. This present study considers an S-CO 2 compressor designed with traditional engineering design tools based on ideal gas behaviour and tested by SANDIA national laboratory. Three-dimensional, steady, viscous flow through the S-CO 2 compressor was analysed with computational fluid dynamics solver based on the finite volume method. Navier-Stokes equations are solved with K- ω (SST) turbulence model at operating conditions in the supercritical regime. Performance of the impeller, the main component of the centrifugal compressor is compared with the impeller with vaneless diffuser and vaned diffuser configurations. The flow characteristics of the shrouded impeller are also studied to analyse the tip-leakage effect.

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2003 Lawrence Livermore National Laboratory Annual Illness and Injury Surveillance Report

10.2172/920676 ◽

2007 ◽

Author(s):

◽

Keyword(s):

Lawrence Livermore National Laboratory ◽

National Laboratory ◽

Injury Surveillance ◽

Surveillance Report

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Stols™ Magnetic Survey At Sandia National Laboratory Technical Area 2

10.3997/2214-4609-pdb.208.1994_059 ◽

1994 ◽

Author(s):

John E. Foley

Keyword(s):

National Laboratory ◽

Sandia National Laboratory ◽

Magnetic Survey ◽

Technical Area

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Sensitivity Study of the South Texas Project Power Plant Steady-State Simulations Using RELAP5-3D Coupled With Dakota

Volume 5: Fusion Engineering; Student Paper Competition; Design Basis and Beyond Design Basis Events; Simple and Combined Cycles ◽

10.1115/icone20-power2012-55235 ◽

2012 ◽

Author(s):

O. A. Rodriguez ◽

R. Vaghetto ◽

Y. A. Hassan

Keyword(s):

Steady State ◽

Power Plant ◽

Uncertainty Quantification ◽

National Laboratory ◽

Sandia National Laboratory ◽

Sensitivity Study ◽

South Texas ◽

Normal Operation ◽

Inlet Temperature ◽

The South

A RELAP5-3D input deck of the South Texas Project (STP) power plant was created in order to study the thermal-hydraulic behavior of the plant during normal operation (steady-state) and during a Loss of Coolant Accident (LOCA). It is important to study the sensitivity of selected output parameters such as the total coolant mass flow rate, the peak clad temperature, the secondary pressure, as a function of specific input parameters (reactor nominal power, vessel inlet temperature, steam generators primary side heat transfer coefficient, primary pressure etc.) in order to identify the variables that play a role in the uncertainty of the thermal-hydraulic calculations. RELAP5-3D, one of the most used best estimate thermal-hydraulic system codes, was coupled with DAKOTA, developed by Sandia National Laboratory for Uncertainty Quantification and Sensitivity Analysis in order to simplify the simulation process and the analysis of the results. In the present paper, the results of the sensitivity study for selected output parameters of the steady-state simulations are presented. The coupled software was validated by repeating one set of simulations using the RELAP5-3D standalone version and by analyzing the simulation results with respect of the physical expectations and behavior of the power plant. The thermal-hydraulic parameters of interest for future uncertainty quantification calculations were identified.

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